If the message "Could not establish the LTE connection. Reason: ESM_FAILURE. Please check the APN settings" is displayed:

Click "Account Information" in the "Internet" menu.

Select your mobile network operator from the drop-down list "Internet service provider". If your provider is listed several times, select the entry that corresponds to your plan. If your mobile network operator is not displayed in the drop-down list:

Select "Other internet service provider" from the drop-down list.

Enable the option "Specify access point name (APN)" and for "Access point" enter the access point name for your mobile network operator. Your provider can provide you with information on the access point name.

Click "Apply" to save the settings.

2 Enabling the FRITZ!Box's DHCP server

In the factory settings, the FRITZ!Box automatically assigns the correct IP settings to all devices via DHCP. If you disabled the FRITZ!Box's DHCP server, re-enable it:

4 Configuring the Internet Explorer

Perform the following step only if you are using Microsoft Internet Explorer and it displays the message "Web page unavailable while offline":

Start the Internet Explorer.

Open the "Tools" menu.

If the menu "Work Offline" entry is displayed and there is a checkmark in front of it, click this entry to remove the checkmark.

Click the "Internet Options" menu entry and then "Connections".

Enable the option "Never dial a connection".

Click "OK" to save the settings.

5 Configuring the computer's firewall

A firewall can interfere with the communication between the computer and the FRITZ!Box:

Configure the firewall on the computer so that it allows connections from the computer to the FRITZ!Box. Refer to the manufacturer of the firewall for information on how to set it up, for example consult the manual.

6 Installing the latest software for network adapters

Install the latest driver for your computer's network adapter or the latest software for the respective device.

Note:Often the Windows Update does not offer all of the latest device drivers. Therefore, use the drivers from the manufacturer's website (for example Intel, Broadcom, Realtek).